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Retirement and Post-Retirement Benefit Plans - Summary of Pre-Tax Net Actuarial Loss (Gain) and Prior Service Benefit Recognized in Accumulated Other Comprehensive Loss for Defined Benefit and Post-Retirement Benefit Plans (Details) $ in Millions	Oct. 31, 2018 USD ($)
Post-Retirement Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net actuarial loss (gain)	$ (180)
Prior service benefit	(74)
Total recognized in Accumulated other comprehensive loss (gain)	(254)
U.S. | Defined Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net actuarial loss (gain)	1,285
Prior service benefit	0
Total recognized in Accumulated other comprehensive loss (gain)	1,285
Non-U.S. | Defined Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net actuarial loss (gain)	311
Prior service benefit	(17)
Total recognized in Accumulated other comprehensive loss (gain)	$ 294

X

- Definition

Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
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Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

+ References

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Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

+ References

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